package day01;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class Test001 {
    static int num = 10;

    public static int sum(){
        num = num + 1;
        return num;
    }

    public static void main(String[] args) {
        System.out.println(sum());
        System.out.println(sum());
        System.out.println(sum());
        System.out.println(sum());



    }
}
